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Quarterly report pursuant to Section 13 or 15(d)

INVENTORIES (Schedule Of Inventories) (Details)

v2.4.0.8
INVENTORIES (Schedule Of Inventories) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
U.S. Iron Ore [Member]
Dec. 31, 2012
U.S. Iron Ore [Member]
Jun. 30, 2013
Eastern Canadian Iron Ore [Member]
Dec. 31, 2012
Eastern Canadian Iron Ore [Member]
Jun. 30, 2013
Asia Pacific Iron Ore [Member]
Dec. 31, 2012
Asia Pacific Iron Ore [Member]
Jun. 30, 2013
North American Coal [Member]
Dec. 31, 2012
North American Coal [Member]
Jun. 30, 2013
Cost Of Goods Sold And Operating Expenses [Member]
North American Coal [Member]
Jun. 30, 2012
Cost Of Goods Sold And Operating Expenses [Member]
North American Coal [Member]
Jun. 30, 2013
Cost Of Goods Sold And Operating Expenses [Member]
North American Coal [Member]
Jun. 30, 2012
Cost Of Goods Sold And Operating Expenses [Member]
North American Coal [Member]
Jun. 30, 2013
Sinter feed [Member]
Wabush [Member]
Cost Of Goods Sold And Operating Expenses [Member]
Jun. 30, 2013
Pellets [Member]
Wabush [Member]
Cost Of Goods Sold And Operating Expenses [Member]
Inventory, Net [Abstract] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Finished Goods $ 427.9 $ 283.2 $ 242.1 $ 147.2 $ 94.0 $ 62.6 $ 51.6 $ 36.7 $ 40.2 $ 36.7 Ìý Ìý Ìý Ìý Ìý Ìý
Work-in Process 101.3 153.3 22.2 22.9 36.5 44.2 28.4 37.2 14.2 49.0 Ìý Ìý Ìý Ìý Ìý Ìý
Total Inventory 529.2 436.5 264.3 170.1 130.5 106.8 80.0 73.9 54.4 85.7 Ìý Ìý Ìý Ìý Ìý Ìý
Lower-of-cost-or-market inventory charges Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 0.7 8.6 2.7 9.9 4.7 11.1
Unsaleable Inventory Impairment Charge Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 10.6